Emergence of intrinsic superconductivity in monolayer 
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Chen, Jianyong; Ge, Yanfeng

doi:10.1103/physrevb.103.064510

Cited by 15 publications

(8 citation statements)

References 68 publications

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“…Clearly, the anisotropic superconducting gap vanishes around 6 K, which is higher than that calculated with the McMillan-Allen-Dynes formula (3.4 K). The similar situations also occur in other systems [64][65][66] and hence our calculation result on the superconductivity of monolayer Ba 2 N is reasonable.…”

Section: (D)supporting

confidence: 86%

Superconductivity in monolayer Ba$_2$N electride: a first-principles study

Qiu,

Zhang,

Yang

et al. 2022

Preprint

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The exploration of superconductivity in low-dimensional materials has attracted intensive attention for decades. Based on first-principles electronic structure calculations, we have systematically investigated the electronic and superconducting properties of the two-dimensional electride Ba2N in the monolayer limit. Our results show that monolayer Ba2N has a low work function of 3.0 eV and a predicted superconducting transition temperature (Tc) of 3.4 K. The superconductivity can be further improved with the tensile strain, which results from the increase of density of states at the Fermi level as well as the enhanced coupling between inner-layer electrons and phonons. Remarkably, at the 4% tensile strain, the acoustic branches have noticeable softening at the K point of Brillouin zone and the superconducting Tc can reach 10.8 K. The effect of lattice strain on the electron transfer from the superficial region to the inner-layer region of monolayer Ba2N may also apply to other electride materials and influence their physical properties.

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Section: (D)supporting

confidence: 86%

Superconductivity in monolayer Ba$_2$N electride: a first-principles study

Qiu,

Zhang,

Yang

et al. 2022

Preprint

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“…Considering that the EPW can better describe the superconducting energy gap and the EPC of layered or lowdimensional systems with respect to the traditional McMillan approximation [39], we, therefore, apply the fully anisotropic Migdal-Eliashberg equations to explore the superconducting energy gap nk and the EPC parameter λ nk on the FL with μ * c = 0.13 as previous works [16][17][18][19][20]. At 5 K t-CuH 2 shows a single superconducting energy gap since the normalized superconducting density of states (SDOS) has a peak at 10.3 meV [Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Among the various 2D materials with exotic properties, 2D superconductors are of great interest not only for their application in constructing nanosuperconducting devices [13,14], but also as a new platform that extends the knowledge of superconductivity [14]. Until now, only several 2D superconducting materials with T c values higher than 20 K have been found, including MnB 3 [15], W 2 N 3 [16][17][18], LiBC [19], MgB 2 [20], buckled triangle borophene [21,22], and B 2 MgB 2 [23]. Therefore, expanding the family of 2D superconducting materials and exploring the possibility of raising their T c s are key areas of research in condensed-matter physics.…”

Section: Introductionmentioning

confidence: 99%

Enhanced superconductivity in CuH2 monolayers

et al. 2022

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Achieving superconductivity in hydrides at lower pressures is a long-standing scientific challenge. Here, we propose that reducing their effective dimensionality might be a possible route to achieve this goal. Firstprinciples structural search calculations identify several two-dimensional transition metal hydrides (TMHs) with phonon-mediated superconductivity. Among them, the two CuH 2 phases with P-3m1 and P-6m2 symmetries are predicted to have the highest T c values up to 44.4 and 47.8 K, comparable to the well-known MgB 2 superconductor. Their superconductivity mainly originates from the coupling of Cu 3d xz /d yz and H-1s electrons with in-plane H-vibrational phonons. Interestingly, both CuH 2 structures show a unique superconducting energy gap by solving the anisotropic Eliashberg equations. Furthermore, the superconductivity of TMHs is closely related to the polarity of the TM-H bond. Our paper paves the way for finding hydride superconductors in low-dimensional materials.

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“…Impressed by the extremely strong EPC in 3D WN and its 2D monolayer W 2 N 3 (our previous work demonstrate that monolayer W 2 N 3 which is composed by two layers of W and N from bulk WN exhibits strong EPC and a predicted T c of 24.58 K [ 47 ] ). We are eager to see whether the strong EPC is ubiquitous in WN films.…”

Section: Resultsmentioning

confidence: 99%

Strong Electron–Phonon Coupling in 3D WN and Coexistence of Intrinsic Superconductivity and Topological Nodal Line in Its 2D Limit

Chen

Gao

2021

Physica Rapid Research Ltrs

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The electron–phonon coupling (EPC) and superconductivity in three‐component‐fermion materials WN, WC, and TaN are systematically investigated using first‐principles calculations. The EPC strength in pristine or pressurized WC and TaN are found to be negligibly weak (<0.2), but can be enhanced significantly by electron doping, and the predicted transition temperatures (Tc) reach the values observed in experiments (≈4 K), demonstrating the vital role of charge doping in the formation of superconductivity. Surprisingly, pristine WN has strong EPC due to a synergistic effect of strong Fermi nesting and large deformation potential and behaves as a good superconductor with Tc of 31 K. Going down from 3D to 2D, WN thin film (i.e., monolayer W3N4) is also predicted to be an intrinsic superconductor with Tc of 11 K. Most importantly, monolayer W3N4 hosts nodal lines that are robust against spin–orbit coupling (SOC), close to the Fermi level and apart from other trivial bands, which are scarce in real materials. The coexistence of high‐transition‐temperature superconductivity and topological states in 3D and 2D WN render them promising platforms for realizing topological superconductivity.

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Emergence of intrinsic superconductivity in monolayer W2N3

Cited by 15 publications

References 68 publications

Superconductivity in monolayer Ba$_2$N electride: a first-principles study

Superconductivity in monolayer Ba$_2$N electride: a first-principles study

Enhanced superconductivity in CuH2 monolayers

Strong Electron–Phonon Coupling in 3D WN and Coexistence of Intrinsic Superconductivity and Topological Nodal Line in Its 2D Limit

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